What is an  API?

API stands for application programming interface. The most important part of this name is “interface,” because an API essentially talks to a program for you. You still need to know the language to communicate with the program, but without an API, you won’t get far.

When programmers decide to make some of their data available to the public, they “expose endpoints,” meaning they publish a portion of the language they’ve used to build their program. Other programmers can then pull data from the application by building URLs or using HTTP clients (special programs that build the URLs for you) to request data from those endpoints.

Endpoints return text that’s meant for computers to read, so it won’t make complete sense if you don’t understand the computer code used to write it.

TL;DR: An API allows one program to request data from another.

Why You Should Use an API

Computers make a lot of things easier, especially tasks that involve collecting and sorting through tons of data. Let’s say you wanted to know how many times a particular business partner submitted invoices to your company. You could feasibly go into your company’s invoice records, scan the “from” data input, and print each invoice individually for your audit.

On the other hand, if all invoices were uploaded to a central database, you could write a simple program that accesses that database and finds all the instances of the partner’s name. This would take much less time and be much more accurate.

Architecture of an API

APIs consist of three parts:

  • User: the person who makes a request
  • Client: the computer that sends the request to the server
  • Server: the computer that responds to the request

Someone will build the server first, since it acquires and holds data. Once that server is running, programmers publish documentation, including the endpoints where specific data can be found. This documentation tells outside programmers the structure of the data on the server. An outside user can then query (or search) the data on the server, or build a program that runs searches on the database and transforms that information into a different, usable format.

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